North of Los Angeles in the oak-studded Montecito foothills, San Ysidro Ranch is often considered a glitzy celebrity hangout. John and Jacqueline Kennedy honeymooned there. Laurence Olivier and Vivien Leigh tied the knot there. Audrey Hepburn, Bing Crosby, Gwyneth Paltrow and Jennifer Lopez stayed there. But the real appeal of this historic 500-acre property just outside Santa Barbara owes more to its rustic roots as a one-time citrus ranch than its high-profile guest list. As part of a four-year renovation completed in 2007, L.A.